[O.B.Left]

A slight misstatement.

He didn't say roll the wrist through impact. He's talking about swiveling the left forearm between follow-through (both arms straight with clubhead still below the hands pointing at the plane line) and Finish when the clubhead finally overtakes the hands. It lays the back of the left wrist flat on the plane angle. And the key is that you have to prepare for that no later than Top in the backswing/startdown. Being able to do it is an important indicator of the health of the stroke. Lynn calls it the "bulletproof vest for the links." He says "It's totally natural, you're just not doin' it."

From impact to follow-through is hinge action, which is keeping the left wrist perpendicular to one of three planes. No actual hand motion occurs. It feels like a full roll, no roll or reverse roll, but no motion actually occurs except in vertical hinging which requires a reverse forearm swivel.

Take a club turned wrong way 'round, or a dowel in the left hand gripped down several inches, at the normal angle, slowly turn the wrist onto the plane angle in the backswing, roll it to vertical at impact, and swivel the left forearm to lay the flat left wrist on the plane angle into Finish, which is after the hinge action between impact and follow-through. A baton twirler's motion.
Keep speeding it up until it becomes one smooth flowing motion, backswing through finish, maintaining the flat left wrist, and it's fairly whistling beyond the impact location. The pivot should support that motion. What's it feel like? Absorb the feel.

The left elbow will point down. That's the same as Jimmy Ballard's advice to keep the left elbow pointed down at all times, which is a little less precise.

Nice save thank you. Hinge through impact, swivel from Follow Through to Finish.